1 files changed, 78 insertions, 5 deletions

diff --git a/OpenSSL/crypto/x509ext.c b/OpenSSL/crypto/x509ext.c
index f65fd0f..f8ecb4a 100644
--- a/OpenSSL/crypto/x509ext.c
+++ b/OpenSSL/crypto/x509ext.c
@@ -236,19 +236,92 @@ crypto_X509Extension_dealloc(crypto_X509ExtensionObj *self)
     PyObject_Del(self);
 }
 
+
+/* Special handling of subjectAltName.  OpenSSL's builtin formatter,
+ * X509V3_EXT_print, mishandles NUL bytes allowing a truncated display that
+ * does not accurately reflect what's in the extension.
+ */
+int
+crypto_X509Extension_str_subjectAltName(crypto_X509ExtensionObj *self, BIO *bio) {
+    GENERAL_NAMES *names;
+    const X509V3_EXT_METHOD *method = NULL;
+    long i, length, num;
+    const unsigned char *p;
+
+    method = X509V3_EXT_get(self->x509_extension);
+    if (method == NULL) {
+        return -1;
+    }
+
+    p = self->x509_extension->value->data;
+    length = self->x509_extension->value->length;
+    if (method->it) {
+        names = (GENERAL_NAMES*)(ASN1_item_d2i(NULL, &p, length,
+                                               ASN1_ITEM_ptr(method->it)));
+    } else {
+        names = (GENERAL_NAMES*)(method->d2i(NULL, &p, length));
+    }
+    if (names == NULL) {
+        return -1;
+    }
+
+    num = sk_GENERAL_NAME_num(names);
+    for (i = 0; i < num; i++) {
+        GENERAL_NAME *name;
+        ASN1_STRING *as;
+        name = sk_GENERAL_NAME_value(names, i);
+        switch (name->type) {
+            case GEN_EMAIL:
+                BIO_puts(bio, "email:");
+                as = name->d.rfc822Name;
+                BIO_write(bio, ASN1_STRING_data(as),
+                          ASN1_STRING_length(as));
+                break;
+            case GEN_DNS:
+                BIO_puts(bio, "DNS:");
+                as = name->d.dNSName;
+                BIO_write(bio, ASN1_STRING_data(as),
+                          ASN1_STRING_length(as));
+                break;
+            case GEN_URI:
+                BIO_puts(bio, "URI:");
+                as = name->d.uniformResourceIdentifier;
+                BIO_write(bio, ASN1_STRING_data(as),
+                          ASN1_STRING_length(as));
+                break;
+            default:
+                /* use builtin print for GEN_OTHERNAME, GEN_X400,
+                 * GEN_EDIPARTY, GEN_DIRNAME, GEN_IPADD and GEN_RID
+                 */
+                GENERAL_NAME_print(bio, name);
+        }
+        /* trailing ', ' except for last element */
+        if (i < (num - 1)) {
+            BIO_puts(bio, ", ");
+        }
+    }
+    sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free);
+
+    return 0;
+}
+
 /*
  * Print a nice text representation of the certificate request.
  */
 static PyObject *
-crypto_X509Extension_str(crypto_X509ExtensionObj *self)
-{
+crypto_X509Extension_str(crypto_X509ExtensionObj *self) {
     int str_len;
     char *tmp_str;
     PyObject *str;
     BIO *bio = BIO_new(BIO_s_mem());
 
-    if (!X509V3_EXT_print(bio, self->x509_extension, 0, 0))
-    {
+    if (OBJ_obj2nid(self->x509_extension->object) == NID_subject_alt_name) {
+        if (crypto_X509Extension_str_subjectAltName(self, bio) == -1) {
+            BIO_free(bio);
+            exception_from_error_queue(crypto_Error);
+            return NULL;
+        }
+    } else if (!X509V3_EXT_print(bio, self->x509_extension, 0, 0)) {
         BIO_free(bio);
         exception_from_error_queue(crypto_Error);
         return NULL;
@@ -267,7 +340,7 @@ PyTypeObject crypto_X509Extension_Type = {
     "X509Extension",
     sizeof(crypto_X509ExtensionObj),
     0,
-    (destructor)crypto_X509Extension_dealloc, 
+    (destructor)crypto_X509Extension_dealloc,
     NULL, /* print */
     NULL, /* getattr */
     NULL, /* setattr  (setattrfunc)crypto_X509Name_setattr, */